I have updated the RFI flow chart to include a UPS in the mix now... The new one is at: https://www.nk7z.net/i-have-rfi-now-what-locating-it/ -- 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Technical Specialist ARRL Volunteer Examiner ARRL Asst. Director, NW Division, Technical Resources